A speeding tanker on Sunday crushed a couple on a motorcycle to death while their two children escaped with minor injuries, police in Maharashtra's Nagpur said. "Suresh Chaudhary(37), his wife Sheetal(32), son Shashwat(6) and daughter Saumya(3) were on a motorcycle and had taken a turn for Outer Ring Road at Vihirgaon under-bridge when a speeding 10-wheeler truck knocked them down," police said.